org.apache.pulsar.broker.service

Class DistributedIdGenerator

java.lang.Object

org.apache.pulsar.broker.service.DistributedIdGenerator

public class DistributedIdGenerator
extends Object

Generate unique ids across multiple nodes.

Each node has an instance of this class and uses the same z-node. At startup each node gets assigned a unique id, using ZK sequential nodes.

After that, each node can just use a local counter and combine, the application prefix, its own instance id and with the counter incremental value to obtain a globally unique id.

Constructor Summary

Constructors

Constructor and Description
DistributedIdGenerator(ZooKeeper zk, String path, String prefix)

Method Summary

Modifier and Type	Method and Description
String	getNextId()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DistributedIdGenerator

public DistributedIdGenerator(ZooKeeper zk,
                              String path,
                              String prefix)
                       throws Exception

Parameters:

zk -

path - path of the z-node used to track the generators ids

prefix - prefix to prepend to the generated id. Having a unique prefix can make the id globally unique

Throws:

Exception

Method Detail

getNextId

public String getNextId()